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Magnetic effects on microstructure and solute plume dynamics of directionally solidifying Ga-In alloy

Magnetic effects on microstructure and solute plume dynamics of directionally solidifying Ga-In alloy

Kao, Andrew ORCID: 0000-0002-6430-2134, Shevchenko, Natalia, He, Shengya, Lee, Peter D., Eckert, Sven and Pericleous, Koulis ORCID: 0000-0002-7426-9999 (2020) Magnetic effects on microstructure and solute plume dynamics of directionally solidifying Ga-In alloy. JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 72 (10). pp. 3645-3651. ISSN 1047-4838 (Print), 1543-1851 (Online) (doi:https://doi.org/10.1007/s11837-020-04305-2)

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Abstract

The effects of applying a 0.2-T transverse magnetic field on a solidifying Ga-25 wt%In alloy have been investigated through a joint experimental and numerical study. The magnetic field introduced significant changes to both the microstructure and the dynamics of escaping high-concentration Ga plumes. Plume migration across the interface was quantified and correlated to simulations to demonstrate that thermoelectric magnetohydrodynamics (TEMHD) is the underlying mechanism. TEMHD introduced macrosegregation within the dendritic structure, leading to the formation of a stable “chimney” channel by increasing the solutal buoyancy in the flow direction. The resulting pressure difference across the solidification front introduced a secondary hydrodynamic phenomenon that subsequently caused solute plume migration.

Item Type: Article
Additional Information: © 2020 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Uncontrolled Keywords: alloy microstructure, solute transport, magnetic fields
Subjects: Q Science > QA Mathematics
Faculty / Department / Research Group: Faculty of Liberal Arts & Sciences
Faculty of Liberal Arts & Sciences > Centre for Numerical Modelling & Process Analysis (CNMPA)
Faculty of Liberal Arts & Sciences > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG)
Faculty of Liberal Arts & Sciences > School of Computing & Mathematical Sciences (CAM)
Last Modified: 04 Nov 2020 19:12
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: REF 6
URI: http://gala.gre.ac.uk/id/eprint/29248

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